CN102739006A - Linear actuator and electric shear device - Google Patents
Linear actuator and electric shear device Download PDFInfo
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- CN102739006A CN102739006A CN2011100983165A CN201110098316A CN102739006A CN 102739006 A CN102739006 A CN 102739006A CN 2011100983165 A CN2011100983165 A CN 2011100983165A CN 201110098316 A CN201110098316 A CN 201110098316A CN 102739006 A CN102739006 A CN 102739006A
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- 238000004804 winding Methods 0.000 claims description 15
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Abstract
An embodiment of the invention discloses a linear actuator and an electric shear device. The linear actuator comprises a stator, a mover doing reciprocating motion relative to the stator, one of the stator and the mover being provided with an electromagnet, a speed detection unit used for detecting a hunting speed of the mover, a power supply unit used for powering the electromagnet, and a control unit used for adjusting power of the power supply unit based on the hunting speed to make the reciprocating motion of the mover constant, wherein, the speed detection unit includes an optical sensor. The linear actuator can ensure the movement speed and amplitude of the mover basically remains constant.
Description
Technical field
The present invention relates to linear actuators, relate in particular to the control method of linear actuators.
Background technology
Electric haircutting scissors generally includes shell, linear actuators, reaches two cutter heads that form shear actions each other; Have at least in the said cutter head one reciprocating under linear actuator drives.But said linear actuators comprises the mover that stator and relative stator move reciprocatingly.Establish the Flexible Reset device between magnetic-coupled each other mover and the stator, one of them establishes electromagnet mover and stator, and wherein another established permanent magnet.After the hair scissors energising, apply alternating current to electromagnet and make it produce alternating magnetic field, this magnetic field and permanent magnet interact, and make mover with fixing substantially natural frequency vibration.Hair scissors in use, the load of actuator usually can change, this variation can cause the movement velocity of mover and amplitude to change, and influences shear effect.
The present invention aims to provide a kind of new linear actuators, can when its load changes, guarantee that the movement velocity and the amplitude of mover keeps constant basically.
Summary of the invention
The embodiment of the invention provides a kind of linear actuators on the one hand, comprising: stator and the mover that can said relatively stator moves reciprocatingly, and one of them establishes electromagnet said stator and mover; Speed detection unit is used to detect the hunting speed of said mover; Power supply unit is used for to said electromagnet power supply; And control unit, be used for adjusting the output power of said power supply unit so that the reciprocating motion of said mover is constant based on said hunting speed; Wherein, said speed detection unit comprises optical sensor.
Preferable, said optical sensor is an infrared ray sensor, comprises infrared emission unit and infrared receiver.
Preferable, said speed detection unit also comprises the light blocking part that is provided with at least one through hole/groove/seam, and one of them said relatively stator of said light blocking part and infrared ray sensor is fixed, and wherein another moves with said mover.
Preferable, said infrared emission unit and infrared receiver relative stator are fixed and are positioned opposite to each other; Said light blocking part is fixed in said mover and can moving between said infrared emission unit and infrared receiver under the drive of mover, makes the infrared signal of said infrared emission unit emission reach said infrared receiver through said through hole/groove/seam at intervals.
Preferable, said stator comprises an annular core, a pair of at least relative salient pole is extended in said annular core inboard, is arranged with winding on the salient pole; Said mover is between said relative salient pole, and the both sides that said mover and salient pole are relative respectively are formed with at least one pair of adjacent permanent magnet poles; Establish the Flexible Reset device between said mover and stator, said mover moves reciprocatingly under the effect of said Flexible Reset device and magnetic field force.
The embodiment of the invention a kind of electronic shear is provided on the other hand; Comprise that linear actuators, at least two can form the cutter head of shear action each other and hold the shell of said actuator in it, at least one in said at least two cutter heads is by said linear actuator drives; Wherein, said linear actuators as previously mentioned.
When embodiment that the present invention lifts can change in the load of linear actuators, guarantee that the movement velocity and the amplitude of mover keeps constant basically.
In order further to understand characteristic of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet institute's accompanying drawing only provide reference and the explanation usefulness, be not to be used for the present invention is limited.
Description of drawings
In the accompanying drawing:
Fig. 1 is the schematic perspective view of moving stator structure of the linear actuators of one embodiment of the invention;
Fig. 2 is the floor map of said moving stator structure;
Fig. 3 is the structured flowchart of the control section of said linear actuators;
Fig. 4 is deformation trace, the induced voltage of winding and the oscillogram of supply power voltage thereof of said mover around the property actuator;
Fig. 5 illustrates a kind of implementation of the speed detection unit of said linear actuators;
Fig. 6 is around the deformation trace of the mover of property actuator, and a kind of oscillogram of the speed detection signal of infrared receiver described in the implementation shown in Figure 5;
Fig. 7 is speed detection signal, and the another kind of oscillogram of the infrared emission signal of infrared emission unit of deformation trace, the infrared receiver of said mover around the property actuator;
Fig. 8 illustrates the another kind of implementation of the speed detection unit of said linear actuators;
Fig. 9 is around the deformation trace of the mover of property actuator, and the oscillogram of the speed detection signal of infrared receiver described in the implementation shown in Figure 8;
Figure 10 illustrates the electronic shear of one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, describe in detail through specific embodiments of the invention, will make technical scheme of the present invention and other beneficial effects obvious.
See also Fig. 1 and Fig. 2, one embodiment of the invention linear actuators comprises stator 10 and mover 30.Establish Flexible Reset device 50 between mover 30 and the stator 10.Said stator 10 comprises an annular core 12, and two relative salient poles 14 are established in said annular core 12 inboards, are arranged with winding 16 on the salient pole 14.Said mover 30 is between two relative salient poles 14; Comprise supporter 32, be installed on the permanent magnet 34 on the supporter 32; Said permanent magnet 34 respectively is formed with a pair of permanent magnet poles on two side directions relative with two salient poles 14; The polarity of a pair of permanent magnet poles of each side is opposite, and the polarity of the permanent magnet poles at both sides relative position place is also opposite; Magnetic field and said magnet 34 that said winding 16 energising backs produce interact, and can make mover 30 relative stator 10 under the effect of Flexible Reset device 50 and magnetic field force do linear reciprocal movement.
Said iron core 12 is square basically, and two relative salient poles 14 extend internally from the two opposite sides (being longer sides the present embodiment) of square iron core 12 respectively.Said Flexible Reset device 50 is located between the other two opposite sides (than minor face) of two ends and square iron core 12 of mover 30 supporters 32.The two ends along its direction of motion of said mover 30 (towards square iron core 12 than minor face) establish guide rod 36 respectively; The two ends of each guide rod 36 are connected to the supporter 32 and iron core 12 of mover 30 respectively; Particularly; Corresponding guide rod 36 ends, mover supporter 32 two ends are established location hole and are inserted for guide rod is terminal, and stator core 12 corresponding guide rod 36 ends are also established location hole for guide rod 36 terminal insertions.Said mover 30 is provided with an output shaft 38, and said output shaft 38 can be used to drive load (like the movable blade of electronic hair cutter) and makes linear reciprocal movement.In the present embodiment, Flexible Reset device 50 is for being set around the helical spring on the guide rod 36.Actuator is under the "on" position, the axis of the output shaft 38 of mover 30 and the oscillation center dead in line of mover 30.
Further, as shown in Figure 3, said linear actuators also comprises at least by speed detection unit 60, power supply unit 70, and the control section formed of control unit 80.Wherein, Speed detection unit 60 is used to detect the movement velocity of mover 30; Power supply unit 70 moves to drive mover 30 to winding 16 power supplies; The movement velocity that control unit 80 is detected based on speed detection unit 60, the output power of adjustment power supply unit 70 is so that mover keeps constant reciprocating motion.
Mover 30 vibrates with fixing substantially natural frequency under the effect of Flexible Reset device 50 and magnetic field force.The action of a magnetic field that winding 16 and permanent magnet are 34 will produce induced voltage on winding 16, the amplitude of the induced voltage of winding 16 is directly proportional with the movement velocity of mover 30.The energy loss that produces for the compensation mechanical friction, is supplied power to winding 16 with impulse form by control unit 80 control power supply units 70 after changing the directions of motion and postpone a scheduled time (T0) to mover 30 to keep the vibration of mover 30; Fig. 4 illustrates the deformation trace of mover 30, the induced voltage of winding 16 and the oscillogram of supply power voltage thereof.Wherein, can confirm the change of mover 30 directions by a direction detecting unit 90 through the zero crossing (like Z1 among Fig. 3, shown in the Z2) of the induced voltage of detection winding 16.
When the load of actuator changes, can cause the movement velocity of mover 30 and amplitude to change.In the present embodiment; For movement velocity and the amplitude that guarantees mover keeps substantially constant; By the movement velocity of speed detection unit 60 detection movers 30, offer the pulsewidth of the pwm signal of winding 16 based on the movement velocity adjustment power supply unit 70 that is detected by control unit 80.
Preferable, as shown in Figure 5, speed detection unit 60 comprises light blocking part 62 and the infrared ray sensor of being made up of infrared emission unit 64 and infrared receiver 66.Infrared emission unit 64 is fixing and positioned opposite to each other with infrared receiver 66 relative stator 10; Light blocking part 62 is fixed on the output shaft 38 of mover 30, and light blocking part 62 is provided with the both sides that two through hole 62a and 62b lay respectively at output shaft 38.When mover 30 motions, can drive light blocking part 62 and make its 66 motions between infrared emission unit 64 and infrared receiver.As two through hole 62a and 62b all not during the transmission path in the infrared signal of infrared emission unit 64 emissions, infrared signal is stopped by light blocking part 62, so infrared receiver 66 can't receive infrared signal; When one of them moved in the transmission path as two through hole 62a and 62b, infrared signal can be passed this through hole and arrived infrared receiver 66; Thus, the infrared signal of infrared emission unit 64 emissions reaches infrared receiver 66 through two through hole 62a and 62b at intervals, makes infrared receiver 66 produce the speed detection signal shown in Fig. 6.Can confirm the movement velocity of mover 30 according to the interpulse time difference Tpw of corresponding two through hole 62a of continuous two difference and 62b in the spacing of two through hole 62a that preset and 62b and the speed detection signal.Infrared emission unit 64 is launched infrared signal under the control of control unit 80, the speed detection signal that infrared receiver 66 produces reaches control unit 80 and handles.As what substitute; Control unit 80 control infrared emission units 64 periodically stop the emission of infrared signal; For example as shown in Figure 7, control unit 80 may command infrared emission units 64 are only launched infrared signal in the preceding half period of each cycle T, and stop emission in the later half cycle.
Fig. 8 illustrates an alternate embodiment of speed detection unit 60, wherein, only establishes through hole 62b in output shaft 38 1 sides on the light blocking part 62.When mover 30 motions; Drive light blocking part 62 and make its 66 motions between infrared emission unit 64 and infrared receiver; Make the infrared signal of infrared emission unit 64 emissions reach infrared receiver 66 through through hole 62b at intervals, thereby make infrared receiver 66 produce the speed detection signal shown in Fig. 9.The movement velocity that can confirm mover 30 according to aperture and the pulsewidth Tw in the speed detection signal of the through hole 62b that presets.Wherein, control unit 80 control infrared emission units 64 are only launched infrared signal in the preceding half period of each cycle T, and stop emission in the later half cycle.
Understandable, among the present invention, light blocking part and infrared ray sensor are as long as one of them said relatively stator is fixed, and wherein another gets final product with the mover motion.
Understandable, above-mentioned through hole can also be to run through groove/seam etc.
Figure 10 illustrates the electronic shear 100 of one embodiment of the invention, comprises that shell 110, power interface 120 are used to connect external power supply, linear actuators 130, two cutter heads 140 and 142 that can form shear action; Wherein, linear actuators 130 can be realized that its stator opposite shell 110 is fixing by the linear actuators in the foregoing description.When power interface 120 energized; The linear actuators control section can obtain power supply from power interface 120, forms shear action thereby with the driving mover its output shaft 138 drive cutter heads 140 relative fixed cutter heads 142 are moved reciprocatingly to the stator winding output pwm signal.Preferable, electronic shear 100 can also comprise that rechargeable battery 150 is electrically connected with linear actuators 130, by the external power charging from power interface 120 inputs, so that electronic shear 100 still can work on a period of time after breaking off external power supply.
Understandable, in more embodiment, linear actuators can comprise two movers with output shaft, and said two output shafts drive two cutter heads respectively and do linear reciprocal movement in the opposite direction with mutual formation shear action.Electronic shear of the present invention for example can be electric shaver, electronic hair cutter etc.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. linear actuators comprises:
Stator and the mover that can said relatively stator moves reciprocatingly, one of them establishes electromagnet said stator and mover;
Speed detection unit is used to detect the hunting speed of said mover;
Power supply unit is used for to said electromagnet power supply; And
Control unit is used for adjusting the output power of said power supply unit so that the reciprocating motion of said mover is constant based on said hunting speed;
Wherein, said speed detection unit comprises optical sensor.
2. linear actuators as claimed in claim 1 is characterized in that said optical sensor is an infrared ray sensor, comprises infrared emission unit and infrared receiver.
3. linear actuators as claimed in claim 2; It is characterized in that; Said speed detection unit also comprises the light blocking part that is provided with at least one through hole/groove/seam, and one of them said relatively stator of said light blocking part and infrared ray sensor is fixed, and wherein another moves with said mover.
4. linear actuators as claimed in claim 3 is characterized in that, said infrared emission unit and infrared receiver relative stator are fixed and be positioned opposite to each other; Said light blocking part is fixed in said mover and can moving between said infrared emission unit and infrared receiver under the drive of mover, makes the infrared signal of said infrared emission unit emission reach said infrared receiver through said through hole/groove/seam at intervals.
5. linear actuators as claimed in claim 4 is characterized in that, said light blocking part has oscillation center axis one side that a through hole/groove/seam is located at said mover.
6. linear actuators as claimed in claim 4 is characterized in that, said light blocking part has the oscillation center axis both sides that two through hole/groove/seams are located at said mover respectively.
7. like each described linear actuators of claim 2 to 6, it is characterized in that said infrared emission unit is configured to periodically stop the emission of infrared signal.
8. like each described linear actuators of claim 2 to 6, it is characterized in that said power supply unit is supplied power to said electromagnet with the pwm signal mode, said control unit is adjusted said output power with the mode of adjusting said pwm signal pulsewidth.
9. each describedly is characterized in that around the property actuator said stator comprises an annular core like claim 1 to 6, and a pair of at least relative salient pole is extended in said annular core inboard, is arranged with winding on the salient pole; Said mover is between said relative salient pole, and the both sides that said mover and salient pole are relative respectively are formed with at least one pair of adjacent permanent magnet poles; Establish the Flexible Reset device between said mover and stator, said mover moves reciprocatingly under the effect of said Flexible Reset device and magnetic field force.
10. linear actuators as claimed in claim 9 is characterized in that said linear actuators also comprises the direction detecting unit, is used to detect the zero crossing of the induced voltage of said winding.
11. linear actuators as claimed in claim 9 is characterized in that, the polarity of the adjacent permanent magnet poles of said each side of mover is opposite, and the polarity of the permanent magnet poles at relative position place, mover both sides is also opposite.
12. as claimed in claim 11ly it is characterized in that around the property actuator said mover is established guide rod respectively along the two ends of the direction of motion, the two ends of each guide rod are connected to mover and stator respectively, said Flexible Reset device is the spring that is set around on the guide rod.
13. an electronic shear comprises that linear actuators, at least two can form the cutter head of shear action each other and hold the shell of said actuator in it, at least one in said at least two cutter heads is by said linear actuator drives; Wherein, each is said for said linear actuators such as claim 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100983165A CN102739006A (en) | 2011-04-15 | 2011-04-15 | Linear actuator and electric shear device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100983165A CN102739006A (en) | 2011-04-15 | 2011-04-15 | Linear actuator and electric shear device |
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| Publication Number | Publication Date |
|---|---|
| CN102739006A true CN102739006A (en) | 2012-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100983165A Pending CN102739006A (en) | 2011-04-15 | 2011-04-15 | Linear actuator and electric shear device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105101811A (en) * | 2013-04-05 | 2015-11-25 | 利乐拉瓦尔集团及财务有限公司 | Stick inserter with electromagnetic drive system |
| CN108237566A (en) * | 2016-12-23 | 2018-07-03 | 阿尔卡特朗讯 | Razor |
| CN108736683A (en) * | 2017-04-19 | 2018-11-02 | 松下知识产权经营株式会社 | Vibration type linear actuator and hairs treating device |
-
2011
- 2011-04-15 CN CN2011100983165A patent/CN102739006A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105101811A (en) * | 2013-04-05 | 2015-11-25 | 利乐拉瓦尔集团及财务有限公司 | Stick inserter with electromagnetic drive system |
| CN108237566A (en) * | 2016-12-23 | 2018-07-03 | 阿尔卡特朗讯 | Razor |
| CN108736683A (en) * | 2017-04-19 | 2018-11-02 | 松下知识产权经营株式会社 | Vibration type linear actuator and hairs treating device |
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Application publication date: 20121017 |